From cfb361f13c8136de78c406745abc4e4456e6d480 Mon Sep 17 00:00:00 2001 From: Shaohua Li Date: Thu, 18 Sep 2008 15:49:14 +0800 Subject: [PATCH] [IA64] utrace syscall.h support for ia64 Add asm/syscall.h for IA64. Utrace requires this. Signed-off-by: Shaohua Li Signed-off-by: Tony Luck --- arch/ia64/include/asm/ptrace.h | 6 +++ arch/ia64/include/asm/syscall.h | 92 +++++++++++++++++++++++++++++++++ arch/ia64/kernel/ptrace.c | 65 +++++++++++++++++++++++ 3 files changed, 163 insertions(+) create mode 100644 arch/ia64/include/asm/syscall.h diff --git a/arch/ia64/include/asm/ptrace.h b/arch/ia64/include/asm/ptrace.h index 15f8dcfe6ee..14055c636ad 100644 --- a/arch/ia64/include/asm/ptrace.h +++ b/arch/ia64/include/asm/ptrace.h @@ -240,6 +240,12 @@ struct switch_stack { */ # define instruction_pointer(regs) ((regs)->cr_iip + ia64_psr(regs)->ri) +static inline unsigned long user_stack_pointer(struct pt_regs *regs) +{ + /* FIXME: should this be bspstore + nr_dirty regs? */ + return regs->ar_bspstore; +} + #define regs_return_value(regs) ((regs)->r8) /* Conserve space in histogram by encoding slot bits in address diff --git a/arch/ia64/include/asm/syscall.h b/arch/ia64/include/asm/syscall.h new file mode 100644 index 00000000000..3fd4fa6c48d --- /dev/null +++ b/arch/ia64/include/asm/syscall.h @@ -0,0 +1,92 @@ +/* + * Access to user system call parameters and results + * + * Copyright (C) 2008 Intel Corp. Shaohua Li + * + * This copyrighted material is made available to anyone wishing to use, + * modify, copy, or redistribute it subject to the terms and conditions + * of the GNU General Public License v.2. + * + * See asm-generic/syscall.h for descriptions of what we must do here. + */ + +#ifndef _ASM_SYSCALL_H +#define _ASM_SYSCALL_H 1 + +#include +#include + +static inline long syscall_get_nr(struct task_struct *task, + struct pt_regs *regs) +{ + BUG_ON(IS_IA32_PROCESS(regs)); + + if ((long)regs->cr_ifs < 0) /* Not a syscall */ + return -1; + return regs->r15; +} + +static inline void syscall_rollback(struct task_struct *task, + struct pt_regs *regs) +{ + BUG_ON(IS_IA32_PROCESS(regs)); + /* do nothing */ +} + +static inline long syscall_get_error(struct task_struct *task, + struct pt_regs *regs) +{ + BUG_ON(IS_IA32_PROCESS(regs)); + + return regs->r10 == -1 ? regs->r8:0; +} + +static inline long syscall_get_return_value(struct task_struct *task, + struct pt_regs *regs) +{ + BUG_ON(IS_IA32_PROCESS(regs)); + + return regs->r8; +} + +static inline void syscall_set_return_value(struct task_struct *task, + struct pt_regs *regs, + int error, long val) +{ + BUG_ON(IS_IA32_PROCESS(regs)); + + if (error) { + /* error < 0, but ia64 uses > 0 return value */ + regs->r8 = -error; + regs->r10 = -1; + } else { + regs->r8 = val; + regs->r10 = 0; + } +} + +extern void ia64_syscall_get_set_arguments(struct task_struct *task, + struct pt_regs *regs, unsigned int i, unsigned int n, + unsigned long *args, int rw); +static inline void syscall_get_arguments(struct task_struct *task, + struct pt_regs *regs, + unsigned int i, unsigned int n, + unsigned long *args) +{ + BUG_ON(IS_IA32_PROCESS(regs)); + BUG_ON(i + n > 6); + + ia64_syscall_get_set_arguments(task, regs, i, n, args, 0); +} + +static inline void syscall_set_arguments(struct task_struct *task, + struct pt_regs *regs, + unsigned int i, unsigned int n, + unsigned long *args) +{ + BUG_ON(IS_IA32_PROCESS(regs)); + BUG_ON(i + n > 6); + + ia64_syscall_get_set_arguments(task, regs, i, n, args, 1); +} +#endif /* _ASM_SYSCALL_H */ diff --git a/arch/ia64/kernel/ptrace.c b/arch/ia64/kernel/ptrace.c index 2a9943b5947..12b1e9f0b7a 100644 --- a/arch/ia64/kernel/ptrace.c +++ b/arch/ia64/kernel/ptrace.c @@ -2199,3 +2199,68 @@ const struct user_regset_view *task_user_regset_view(struct task_struct *tsk) #endif return &user_ia64_view; } + +struct syscall_get_set_args { + unsigned int i; + unsigned int n; + unsigned long *args; + struct pt_regs *regs; + int rw; +}; + +static void syscall_get_set_args_cb(struct unw_frame_info *info, void *data) +{ + struct syscall_get_set_args *args = data; + struct pt_regs *pt = args->regs; + unsigned long *krbs, cfm, ndirty; + int i, count; + + if (unw_unwind_to_user(info) < 0) + return; + + cfm = pt->cr_ifs; + krbs = (unsigned long *)info->task + IA64_RBS_OFFSET/8; + ndirty = ia64_rse_num_regs(krbs, krbs + (pt->loadrs >> 19)); + + count = 0; + if (in_syscall(pt)) + count = min_t(int, args->n, cfm & 0x7f); + + for (i = 0; i < count; i++) { + if (args->rw) + *ia64_rse_skip_regs(krbs, ndirty + i + args->i) = + args->args[i]; + else + args->args[i] = *ia64_rse_skip_regs(krbs, + ndirty + i + args->i); + } + + if (!args->rw) { + while (i < args->n) { + args->args[i] = 0; + i++; + } + } +} + +void ia64_syscall_get_set_arguments(struct task_struct *task, + struct pt_regs *regs, unsigned int i, unsigned int n, + unsigned long *args, int rw) +{ + struct syscall_get_set_args data = { + .i = i, + .n = n, + .args = args, + .regs = regs, + .rw = rw, + }; + + if (task == current) + unw_init_running(syscall_get_set_args_cb, &data); + else { + struct unw_frame_info ufi; + memset(&ufi, 0, sizeof(ufi)); + unw_init_from_blocked_task(&ufi, task); + syscall_get_set_args_cb(&ufi, &data); + } +} -- 2.41.1